About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
For more information about security, see the Apple Product Security page.

Safari 16.4
Released March 27, 2023
WebKit
Available for: macOS Big Sur and macOS Monterey
Impact: Processing maliciously crafted web content may bypass Same Origin Policy
Description: This issue was addressed with improved state management.
WebKit Bugzilla: 248615
CVE-2023-27932: an anonymous researcher
WebKit
Available for: macOS Big Sur and macOS Monterey
Impact: A website may be able to track sensitive user information
Description: The issue was addressed by removing origin information.
WebKit Bugzilla: 250837
CVE-2023-27954: an anonymous researcher
WebKit Web Inspector
Available for: macOS Big Sur and macOS Monterey
Impact: A remote attacker may be able to cause unexpected app termination or arbitrary code execution
Description: This issue was addressed with improved state management.
CVE-2023-28201: Dohyun Lee (@l33d0hyun), crixer (@pwning_me) of SSD Labs
Entry added May 1, 2023

Additional recognition
CFNetwork
We would like to acknowledge an anonymous researcher for their assistance.
WebKit
We would like to acknowledge an anonymous researcher for their assistance.
WebKit Web Inspector
We would like to acknowledge Dohyun Lee (@l33d0hyun) and crixer (@pwning_me) of SSD Labs for their assistance.